154 



ART. 3. — B. KOTO : 



are, according to Uyeda and Yamagüchi, found exposed from under 

 the lava-sheet (100 m. thick) of the North Cone. From this im- 

 portant find it is evident, that the first phase of the activity of 

 the Sakura-jima volcano was explosive, followed later by the 

 outpourings of the rheumatitic material which built up the apparent 

 tholoide (though really konide) of the present North Cone. 



The above-mentioned Atago-yama of dubious origin is a 

 geologic island left untouched by the recent lava-flows (Geologic 

 Map). The patch (n) of the Ogawara gulch is the inlier or fenster 

 exposed through erosion from under the lava of the south cone. 

 The recent éjecta of rock of this type (the north cone type) 

 were found largely intermixed with the juvenile lavas on the 

 western slope. 



The volcanic plug (?) of Ilikino-hira (Hyoku-oka). — A hornito- 

 like boss elevates itself on tlie western slope to a considerable 

 height (553 m.), though the northeast edge blends upwards with 



Fig. 31. — The volcanello Furnliata on the western slope. (Photo by Mr. Yixmagnchi.) 

 Yv — Yuno-hira vent. y — Yuno-hira somma. F — Collai^sed dome of Furuhata. 



H — Hakama-goshi. Ktj — Kanzé islet. k— Kagoshima. 



